sw.fmu.RUnlock()

	af, err := f.apply(so)
	if err != nil {
		return syscall.InvalidHandle, err
	}
	s, so.Err = windows.WSASocket(family, sotype, proto, protinfo, group, flags)
	if err = af.apply(so); err != nil {
		if so.Err == nil {
			syscall.Closesocket(s)
		}
		return syscall.InvalidHandle, err
	}

	sw.smu.Lock()
	defer sw.smu.Unlock()
	if so.Err != nil {

// responsiveness on machines with high CPU utilization.
func createWindowsJobObject(pc uint32) (windows.Handle, error) {
	job, err := windows.CreateJobObject(nil, nil)
	if err != nil {
		return windows.InvalidHandle, fmt.Errorf("windows.CreateJobObject failed: %w", err)
	}
	limitInfo := windows.JOBOBJECT_BASIC_LIMIT_INFORMATION{
		LimitFlags:    windows.JOB_OBJECT_LIMIT_PRIORITY_CLASS,
		PriorityClass: pc,
	}

	s, err := wsaSocketFunc(int32(family), int32(sotype), int32(proto),
		nil, 0, windows.WSA_FLAG_OVERLAPPED|windows.WSA_FLAG_NO_HANDLE_INHERIT)
	if err != nil {
		return syscall.InvalidHandle, os.NewSyscallError("socket", err)
	}
	return s, nil

//sys	CreateNamedPipe(name *uint16, flags uint32, pipeMode uint32, maxInstances uint32, outSize uint32, inSize uint32, defaultTimeout uint32, sa *SecurityAttributes) (handle Handle, err error)  [failretval==InvalidHandle] = CreateNamedPipeW
//sys	ConnectNamedPipe(pipe Handle, overlapped *Overlapped) (err error)

// methods to stop working.
func (file *File) Fd() uintptr {
	if file == nil {
		return uintptr(syscall.InvalidHandle)
	}
	return uintptr(file.pfd.Sysfd)
}

// newFile returns a new File with the given file handle and name.
// Unlike NewFile, it does not check that h is syscall.InvalidHandle.
func newFile(h syscall.Handle, name string, kind string) *File {
	if kind == "file" {
		var m uint32

//sys	CloseHandle(handle Handle) (err error)
//sys	GetStdHandle(stdhandle int) (handle Handle, err error) [failretval==InvalidHandle]
//sys	findFirstFile1(name *uint16, data *win32finddata1) (handle Handle, err error) [failretval==InvalidHandle] = FindFirstFileW
//sys	findNextFile1(handle Handle, data *win32finddata1) (err error) = FindNextFileW
//sys	FindClose(handle Handle) (err error)

	if err := fd.readLock(); err != nil {
		return syscall.InvalidHandle, nil, 0, "", err
	}
	defer fd.readUnlock()

	o := &fd.rop
	var rawsa [2]syscall.RawSockaddrAny
	for {
		s, err := sysSocket()
		if err != nil {
			return syscall.InvalidHandle, nil, 0, "", err
		}

		errcall, err := fd.acceptOne(s, rawsa[:], o)
		if err == nil {

func lockPath(path string) (uintptr, error) {
	if len(path) == 0 {
		return uintptr(syscall.InvalidHandle), syscall.ERROR_FILE_NOT_FOUND
	}
	pathp, err := syscall.UTF16PtrFromString(path)
	if err != nil {
		return uintptr(syscall.InvalidHandle), err
	}
	access := uint32(syscall.GENERIC_READ)
	sharemode := uint32(syscall.FILE_SHARE_READ)
	createmode := uint32(syscall.OPEN_EXISTING)

	handle = Handle(r0)
	if handle == InvalidHandle {
		err = errnoErr(e1)
	}
	return
}

func CreateHardLink(filename *uint16, existingfilename *uint16, reserved uintptr) (err error) {

	}

	return os.NewFile(uintptr(fd), path), nil
}

func lockFile(fd syscall.Handle, flags uint32) error {
	// https://msdn.microsoft.com/en-us/library/windows/desktop/aa365203(v=vs.85).aspx
	if fd == syscall.InvalidHandle {
		return nil
	}

	err := lockFileEx(fd, flags, 1, 0, &syscall.Overlapped{})
	if err == nil || err == errLockViolation {
		return nil
	}